Caulking gun



FIG. 1 is a perspective view of a caulking gun showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof, this being a mirror image of the right side thereof;

FIG. 5 is a rear elevational view of one side thereof; and,

FIG. 6 is a front elevational view thereof. 

The ornamental design for a caulking gun, as shown and described. 